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Magnetic resonance imaging device, phase value correction method and program

a magnetic resonance imaging and phase value correction technology, applied in the field of spectroscopic imaging, can solve the problems of insufficient effect of eddy current correction, inability to identify and extract phase jump regions, and inability to completely remove ringing artifacts, etc., to achieve the effect of improving the accuracy of correction

Active Publication Date: 2017-06-13
FUJIFILM HEALTHCARE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0020]According to the present invention, in the correction of spectral distortion caused by an eddy current in an MRI device, artifacts generated by the correction can be suppressed by a simple method to improve accuracy of the correction.

Problems solved by technology

However, even if the method of Non-patent document 2 is used, low frequency components of phase jumps remain, and therefore the ringing artifacts cannot be completely removed.
Moreover, since radio frequency components of eddy currents are cut, sufficient effect of eddy current correction cannot be obtained.
Further, when there are a plurality of sharp phase changes, it is difficult to identify and extract the phase jump regions from them.
Further, when there are a plurality of phase jumps of different phase change amounts, in order to enhance fitting accuracy, it is necessary to perform the fitting for every phase jump generation region, and thus the processing comes to be complicated.
Therefore, it is necessary to determine the phase change amounts of the correction regions in accordance with temporal changes of the phase values, and perform the correction so that the correction regions and the other regions are smoothly connected, and thus the processing comes to be complicated.

Method used

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  • Magnetic resonance imaging device, phase value correction method and program
  • Magnetic resonance imaging device, phase value correction method and program
  • Magnetic resonance imaging device, phase value correction method and program

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Embodiment Construction

[0048]Hereafter, embodiments of the present invention will be explained. In all the drawings for explaining the embodiments, components having the same functions are indicated with the same numerals, and repetitive explanations thereof are omitted.

[0049]First, magnetic resonance imaging devices (MRI devices) according to this embodiment of the present invention will be explained. FIGS. 1A to 1C are exterior views of MRI devices according to this embodiment. FIG. 1A shows an MRI device 100 of the horizontal magnetic field type utilizing a tunnel-shaped magnet that generates a static magnetic field with a solenoid coil. FIG. 1B shows an MRI device 120 of the vertical magnetic field type utilizing a hamburger type (open type) magnet having separated upper and lower magnets, which are used for increasing spaciousness. Further, FIG. 1C shows an MRI device 130 utilizing a tunnel-shaped magnet similar to that shown in FIG. 1A, but depth of the magnet is shortened and the magnet is leaned t...

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Abstract

An object of the present invention is to suppress artifacts generated by correction of spectral distortion induced by eddy currents in MRI devices with a simple method, and thereby improve accuracy of the correction.

Description

TECHNICAL FIELD[0001]The present invention relates to spectroscopic imaging, especially an eddy current correction technique therefor for correcting spectral distortion induced by eddy current and so forth.BACKGROUND ART[0002]In magnetic resonance signals measured in MRI, there is observed the chemical shift phenomenon, which means small differences of resonance frequency originated in difference in molecular structure. There are known MRS (Magnetic Resonance Spectroscopy), in which magnetic resonance signals are separated for every molecule (metabolite) by using the chemical shift phenomenon to obtain spectra, as well as CSI (Chemical Shift Imaging) and MRSI (Magnetic Resonance Spectroscopic Imaging), in which spatial signal intensity distribution is imaged for every metabolite.[0003]Major metabolites of human bodies detectable by MRS or MRSI include choline (Cho), creatine (Cr), N-acetylaspartic acid (NAA), lactic acid (Lac), and so forth. Amounts of these metabolites enable stage...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01R33/46G01R33/485G01R33/565A61B5/055
CPCG01R33/4625G01R33/485G01R33/56518A61B5/055
Inventor SHIRAI, TORUBITO, YOSHITAKAHIRATA, SATOSHISOUTOME, YOSHIHISA
Owner FUJIFILM HEALTHCARE CORP